71.   The model is also being used by the Department of Energy to simulate nuclear explosions and by pharmaceutical companies to design new drugs.

72.   The movie depicts the desolation after a nuclear explosion.

73.   The only nuclear power that is still conducting tests, China had argued that nuclear explosions should be allowed for civilian purposes, like large construction projects.

74.   The old rate, based on orbital data from early-warning satellites that watch for rocket firings and nuclear explosions with telescopes, was eight impacts a year.

75.   The nuclear explosions take place within a shaft drilled into the underlying volcanic rock.

76.   The segment featured a young girl picking daisies in a field followed by the startling image of a nuclear explosion.

77.   The researchers said that this type of internal structure would make it more difficult to divert an asteroid with a nuclear explosion.

78.   The treaty bans all nuclear explosions and will try to rein in the development of nuclear weapons.

79.   The two countries, old enemies, have been tense since India and then Pakistan set off nuclear explosions last month.

80.   The treaty would ban all nuclear explosion tests.